Mold



Patented Apr. 22, 1924.

STATES PATENT OFFICE.

ILLINO'IS, ASSIGNOR TO JAMES B. CLOW & SONS, OF

A CORPORATION ILLINOIS.

mom).

Application filed July 27, 1922. Serial No. 577,843.

To all whom it may concern:

Be it known that I,

JOHN A. Briiiis, a

citizen of the United States, and resident of Chicago, lllinois, haveinvented useful Improvement in following is a full, clear,

being had to description, reference in the county of Cook and State of acertain new and Molds, of which the concise, and exact the accompanyingdrawing, forming a part of this speci iication. l

The present invention relates to molds for casting molten metal and itsprincipal object is the provision of a collapsible, preferablypermanent, core especially useful in formino the bell end of pipes castin a centrifugfil casting machine.

In the drawing Figure 1 is a broken diametrical section of a mold andcore embodying the invention.

Figure 2 is a section Figure 1.

The collapsible core i drawings applie metal mold 1. mounted and rotatedlfion of molten metal in ner the pipe 2 will be force. The body of theout the use of a core but tion of the bell end 3 of core for thedefinition of on the line 2-2 in s illustrated in the d to the bell endof a tubular The mold 1 is to be suitably so that upon introducthepreferred mancast by centrifugal pipe 2 is cast withthe peculiarformathe pipe requires a its internal surface.

It is desirable to use a permanent metal core and in order that the cremoved from the pipe of the present invention ore may be readily thecollapsible core is provided. This is especially desirable in view ofthe fact that the bell end 3 of the pipe generally must be formed with acircular depression 4 in which to seat a lead ring for packing the jointbetween contiguous pipes in installation. l

The core comprises a a forwardly facing sho ring 5 formed with ulder 6.A multipart tubular member 7-8 fits against the internal periphery ofthe r at its front end with ing 5 and is formed a ange engaging againstthe shoulder 6 of the ring 5. The

tubular member yond the ring 5 and 7-8 projects inwardly bethe outersurface of this projecting portion is provided with a configurationdesired to be produced in the ir.-

ner surface of the bell end of the pipe to be cast. lThe multi-parttubular member 7-8 as illustrated in Figure related -to each other as 2has its parts so to render. the member' inwardly collapsible unlesslocked in position. Preferably, as illustrated in Figure 2, the tubularmember consists of two similar pieces 7 and two similar pieces 8, soformed that the pieces 7 may be removed toward the center of the member,whereupon the members 8 may also be removed. Normally the tubular member7-8 is held in position on the ring 5 by a locking ring 10 fittingwithin the tubular member and formed at its outer end with a flange 11adapted to lock the flange of the tubular member 7-8 against theshoulder 6 of the ring 5. Preferably, the tubular member 7-8 is formedat its rear end with an undercut beveled groove 9 and the inner end ofthe locking rin 10 is correspondingly beveled. The locking ring 10 maybe conveniently secured in position by wedges 13 driven through slots inpins 12 projecting from the face of the ring 5. Y

In preparing to cast a pipe the parts 7-8 of the tubular member will beassembled within the ring 5 and secured therein by wedging the lockingring 10 in position. The complete core thus assembled is then secured inthe end of the mold 1 by wedges 14 driven through holes 15 in the end ofthe mold, the wedges 14 serving to clamp the ring 5 against aperipheralshoulder 16 in the mold 1. After the pipe has been cast the pipe andcore may be withdrawn from the mold and the core then removed from thepipe or the core may be removed before the removal of the pipe from themold. In either event, removal of the wedges 13 and the locking ring 10permits the multi-part tubular member 7-8 to be collapsed inwardlytoward the axis of the pipe. After removal of the ring 5 the parts mayagain be assembled and secured in the mold for the next castingoperation.

Having thus described my invention, `what l claim as new and desire tosecure by'Letters Patent of the United States is 1. A molding core,comprising a plurality of segments fitted together and exteriorlyforming a molding surface, the segments being inwardly collapsible, anannular member encircling the segments, an annular member fitted withinthe segments, and means for locking the annular members and segmentstogether, the assembled core being hollow.

2. A molding core, comprising a plurality of segments fitted togetherand exteriorly 3. A molding core, comprising a' plurality of segmentsfitted together and exteriorly forming a molding surface, the segmentsbeing inwardly collapsible, an annular member encircling the segmentsand formed with a molding surface extending outwardly from the moldingsurface'formed by the segments, a second annular member fitted withinthe segments, and means for locking the annular members and segmentstogether.

4. A molding core, comprising a. plurality of segments fitted togetherand exteriorly forming a molding'surface, the segments being inwardlycollapsible, an annularA member encircling the segments and formed withamolding surface extending outwardly from the molding surface formed bythe segments, the annular member and segments being formed\vithinterengaging shoulders, a second annular member fitted within thesegments and provided with an annular fiange adapted to force theshoulders intov engagement, and means for securing the second annularmember to the first annular member.

5. The combination of a tubular mold by the segformed internally with amoldiuaer surface, a. plurality of segments tted toget er and exteriorlyforming a molding surface, s aced from that of the mold, the segmentseing inwardly collapsible, an annular member removably secured to with amolding surface intersecting the molding surfaces of the mold andsegments, a second annular member fitted within the segments, and meansfor locking the annular members and scgn'lents together.

6. A molding core, comprising a plurality of segments fitted together,the segthe mold and formedY ments being inwardly collapsible, and means.for securing the segments against suoli inward collapse, the core beinghollow and having exterior-ly a generally cylindrical molding surfaceand an annular molding surface extending radially outwardly therefrom.

7. The combination of a tubular mold formed internally with ,a moldingsurface, a core comprising a plurality of inwardly collapsible segmentsfitted together, the core having exteriorly a generally cylindricalmolding surface and an annular molding surface extending outwardlytherefrom to the molding surface of the mold, means for securing thesegments against collapse, and means for securing the core to the mold.

In witness whereof', I hereunto subscribe my name this 24th-day of July,`1922. 4 JOHN A. BYERS.

